Sectional core for molds.



. Patented Dec. 28, 1915.

, O. B. LINDQUIST.

SECTIONAL CORE FOR MOLDS.

APPLICATION FILED APR. 20. 1914.

OTTO B. LINDQ'UIST, 0F TARENTUM, PENNSYLVANIA.

SECTIONAL 003E FOB- MOLDS.

Application filed April 20, 1 914.

T 0 aZZ whom it may concern Be it known that l, OTTO B. LINn UIsT, acitizen of the United States, residing at Tarentum, in the county ofAllegheny and State of Pennsylvania, have invented new and usefulImprovements in Sectional Cores for Molds, of which the following is aspecification.

My invention relates to sectional cores for molds.

It is the principal object of my invention to provide for moldssectional cores which may be readily removable as soon as the metal castin contact therewith has solidified.

Another object is to provide a sectional core whose sections may yieldas the cooling metal cast around them contracts.

My invention further comprises the peculiar shape of the core sectionswhereby the latter may be rotated or swung" inwardly away from thecasting preliminarily to its removal.

Another object is to provide special yieldable means for holding thecoresections in their normal or outer position.

Other objects will appear hereinafter.

Referring to the accompanying drawings, Figure 1 is a central verticalsection through a mold embodying the preferred form of my invention;Fig. 2, a top plan view of Fig. 1 with the clamping; ring removed ;v andFig. 3, a bottom plan view of the core sections.

On the drawings, 1 designates the base plate composed preferably ofsteel. It is provided with a central depression 2 to receive the lowerend of the core and to determine the normal position of the coresections with respect to the corners and sides of the mold and to limittheir outward movements.

The core may consist of any desired number of vertical sections arrangedto form substantially a continuous outer surface, which will varyaccording; to the cross-sec tional shape of the article to be cast inthe mold. l have shown my core composed of four sections arranged toform the inner surface of an ingot mold. These sections are eachsomewhat L-shaped, the vertical Specification of Letters Patent.

"the other sleeve 7.

Patented Dec 28, tars.

Serial No. 833 .064.

angles of the sections being rounded as shown on Figs. 2 and 3. l haveshown the sections having their adjacent edges at the central portion ofthe sides of the mold but these edges may be placed elsewhere. The upperends of the core sections are provided with shoulders i all in the sameplane to receive the clamping ring 5 which determines the normalposition of the upper ends of the core sections and limits their outwardmovements.

6 represents a vertical rod standing in the center of the vertical spaceinclosed by the core sections 3. On the rod 6 I place the sleeve 7 whichis slidable thereon within limits fixed by the collars 8 secured to therod 6 below the center of the rod or near the lower end thereof. Abovethe center of the rod 6 I locate another sleeve 7 movable within limitsfixed by the collars S secured to the said rod. Each of the sleeves 7 isprovided with outwardly bowed springs 9 preferably arranged in multipleninety degrees adart on the sides of the 'sleeves 7. The rod 6 and thesleeves 7 are constructed to preven; the sleeves 7 from rotating on therod and to keep the springs 9 of one sleeve 7 in vertical alinement withthe springs on To secure this i have made the rod 6 square incross-section and provided the sleeves 7 with square openings to thesame. The inner faces 10 of the said sections 3 are made flat to formguides and bearings for the springs 9. These faces flare upwardly from apoint near their lower ends and the pressure of the springs against thecore sections increases as the sleeves 7 are forced downwardly by therods (3. The lower ends of these surfaces are flared downwardly as shownat 11 to reduce the weight.

T he adjacent edges of the said sections are preferably constructed asfollows :-One edge of each section is provided with the shoulder 12formed in the outer surface of the section. From the bottom or innerportion of the shoulder 12 the said edge extends obliquely toward thecenter of the core and tie edge of the adiacent section, this obliquesurface being indicated by the numeral 13.

The remaining edge of each core section is provided with the shoulderlfl: out in the outer surface of the section. From the bottom of thisrecess the surface of the said edge extends obliquely toward the centerof the mold and the edge of the adjacent section for a short distance orto the point 15, from which the said edge extends obliquely toward thecenter of the core and substantially parallel to the adjacent surface 13of the adjacent core section 3. lelormally the adjacent edges of thesections are separated slightly from each other, the space between theadjacent edges being filled with molding sand 16 or other suitablematerial to make the said space flush with the sides of the saidsections.

When the casting contracts around the core the sections 3 will moveinwardly and crush the molding sand in the spaces between the sectionsand thereby relieve the stress on the casting and prevent the castingfrom sticking so tightly to the sections.

16 represents a mold preferably composed of steel which surrounds thecore so as to leave a space 17 around the core into which the metal maybe poured through the gate 18 in a manner well known. In Fig. 2 I haveshown the casting 19 in the space 17.

As soon as the casting 19 has solidified in the space 17 the clampingring 5 and the rod 6 are withdrawn from the core sections. Thewithdrawal of the rod 6 withdraws the sleeves and springs carriedthereby and leaves the space inclosed by the core sections empty so thatone of the core sections may be swung or rotated inwardly toward thecenter of the core and away from the castings on an imaginary verticalaxis near one edge. The core sections are withdrawn from the casting bysuitable apparatus connected to the staples 20 secured in the tops ofthe core sections. I prefer that the inclined opposing faces on adjacentsections shall have their inclination in the same direction withreference to their cutting through an imaginary circle drawn throughthem from the center of the space inclosed by the core sections. Theinterior of the mold 16 tapers slightly upwardly and the assembled coretapers correspondingly The lower ends of the core sections willaccordingly be slightly wider than their upper ends. It would,therefore, be impossible to pull the assembled core upwardly out of thecasting 19 as each core section would act as a key to pre vent the corefrom contracting suiliciently. I rotate one of the core sections towardthe center of the core, as already stated, where there is suflicientspace to permit the removal of the same by an upward pull thereon. Theother sections being now unlocked or released can be readily removedfrom the casting. When the rod 6 is pushed down hetween the coresections the friction of the springs 9 on the faces 10 causes thesleeves 7 to be in engagement with their respective upper collars 8.When the rod 6 is to be removed, it is drawn up so as to cause the lowercollars 8 to deliver hammer-like strokes against the bottom of thesleeves 7 in order to loosen the latter and drive the same upwardly.

I claim 1. In a mold, a mold-body, a plurality of core sections in themold-body, arranged with their adjacent edges separated, means forlimiting the outward movement of the sections, means for yieldinglyholding the core sections in contact with the said limiting means, and afragile means filling the spaces between the said adjacent edges of thecore sections and collapsible when the cool ing casting between the moldand the coresections shrinks on the latter.

2. In. a mold, a mold body, a plurality of core sections arranged in themold body with their adjacent edges separated when in their normalpositions, a fragile means insertible between the adjacent edges of thesaid sections for yieldingly holding the sections in the said positions,a base plate having a depression to receive the lower ends of thesections and limit their outward movement, and means embracing the upperends of the sections to limit their outer movement.

3. In a mold, a mold body, a plurality of core sections arranged in themold body with their adjacent edges separated when in their normalpositions, a vertical removable bar insertible between the sections,collars in which the bar is slidable, springs carried by the collars andbearing against the inner faces of the sections for holding themyieldingly in their normal positions and stops on the bar for limitingthe movement of the bar in the collars, the stops acting as nammers onthe collars for moving the latter.

l. In a mold, a core including a series of verticalcore sectionsarranged to inclose a vertical space and form the inner surface of acasting and having their adjacent edges overlapping, one edge of eachsection lying between the edge of the adjacent section and the center ofthe core, and removable means in the said space for holding the sectionsin their normal positions.

5. In a mold, a coreincluding a series of vertical cor: sectionsarranged to inclose a vertical space and to form the inner surface of acasting, the adjacent edges of the sections being spaced apart andoverlapping, the opposing faces of the overlapping portions of the edgesbeing inclined in the same direction, whereby each section may be swungtoward the center of the space and freed from the casting contiguousthereto.

6. In a mold, a core including a series of vertical core sectionsarranged to inclose a Signed at Pittsburgh, Pa., this 16th day verticalspace and to form the inner surface of April, A. 1)., 1914. of acasting, the adjacent edges of the sections being spaced apart, wherebya section OTTO LINDQUIST' may be swung toward the center of theWitnesses:

space and freed from the casting contigu- WV. LESTER WALKER,

ous thereto. H. B. PAVITT.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington, D. C.

